Minimum Aviation System Performance Standards for Aircraft ...

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2.2.1.2.1 ATS Provider Needs for Separation and Conflict Management in En Route and
Terminal Airspace
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Current requirements in the En Route and Terminal airspace are deemed to be much less
stressful than the other applications in Section TBD. This airspace may be further
divided into the use of ADS-B Out in Non Radar Airspace (NRA) and ADS-B Out in
Radar Airspace (RAD). Characteristics of surveillance systems currently in use in the
NAS for En Route and Terminal are listed in Table 2-9(a). These characteristics are
provided for information and comparison only. ADS-B will support equal or better
surveillance application performance (e.g., see Table 2-9(b)). Traffic densities and
operational domain radius can be used for expected loading on the ADS-B data link
broadcast medium.
The high level performance requirements for the existing ADS-B Out NRA, RAD and
APT applications are contained in Table 2-10.
The existing degree of independence between navigation and surveillance will be needed
in the future until combined system performance standards are developed [6].